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CVE-2025-21844— smb: client: Add check for next_buffer in receive_encrypted_standard()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未检查next_buffer返回值，可能导致空指针取消引用。

CVSS 7.5 · High EPSS 0.62% · P49

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux b03c8099a738a04d2343547ae6a04e5f0f63d3fa< f277e479eea3d1aa18bc712abe1d2bf3dece2e30 affected
858e73ff25639a0cc1f6f8d2587b62c045867e41< f618aeb6cad2307e48a641379db610abcf593edf affected
9f528a8e68327117837b5e28b096f52af4c26a05< 24e8e4523d3071bc5143b0db9127d511489f7b3b affected
534733397da26de0303057ce0b93a22bda150365< 9e5d99a4cf2e23c716b44862975548415fae5391 affected
eec04ea119691e65227a97ce53c0da6b9b74b0b7< a9b0b4b29877cb4dc5d0842b59b5ccbacddb85bd affected
eec04ea119691e65227a97ce53c0da6b9b74b0b7< 554736b583f529ee159aa95af9a0cbc12b5ffc96 affected
eec04ea119691e65227a97ce53c0da6b9b74b0b7< 860ca5e50f73c2a1cef7eefc9d39d04e275417f7 affected
5.10.211< 5.10.235 affected
… +12 more rows
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I. Basic Information for CVE-2025-21844

Vulnerability Information
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Vulnerability Title
smb: client: Add check for next_buffer in receive_encrypted_standard()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: Add check for next_buffer in receive_encrypted_standard() Add check for the return value of cifs_buf_get() and cifs_small_buf_get() in receive_encrypted_standard() to prevent null pointer dereference.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未检查next_buffer返回值，可能导致空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux b03c8099a738a04d2343547ae6a04e5f0f63d3fa ~ f277e479eea3d1aa18bc712abe1d2bf3dece2e30 -
Linux Linux 6.7 -

II. Public POCs for CVE-2025-21844

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III. Intelligence Information for CVE-2025-21844

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Other References for CVE-2025-21844 (6)

Same Patch Batch · Linux · 2025-03-12 · 26 CVEs total

CVE-2024-58087 9.8 CRITICAL ksmbd: fix racy issue from session lookup and expire
CVE-2025-21850 9.8 CRITICAL nvmet: Fix crash when a namespace is disabled
CVE-2025-21855 8.6 HIGH ibmvnic: Don't reference skb after sending to VIOS
CVE-2024-58089 7.8 HIGH btrfs: fix double accounting race when btrfs_run_delalloc_range() failed
CVE-2025-21858 7.8 HIGH geneve: Fix use-after-free in geneve_find_dev().
CVE-2025-21851 7.8 HIGH bpf: Fix softlockup in arena_map_free on 64k page kernel
CVE-2025-21864 7.8 HIGH tcp: drop secpath at the same time as we currently drop dst
CVE-2025-21852 net: Add rx_skb of kfree_skb to raw_tp_null_args[].
CVE-2025-21865 gtp: Suppress list corruption splat in gtp_net_exit_batch_rtnl().
CVE-2024-58088 bpf: Fix deadlock when freeing cgroup storage
CVE-2025-21845 mtd: spi-nor: sst: Fix SST write failure
CVE-2025-21846 acct: perform last write from workqueue
CVE-2025-21848 nfp: bpf: Add check for nfp_app_ctrl_msg_alloc()
CVE-2025-21847 ASoC: SOF: stream-ipc: Check for cstream nullity in sof_ipc_msg_data()
CVE-2025-21849 drm/i915/gt: Use spin_lock_irqsave() in interruptible context
CVE-2025-21863 io_uring: prevent opcode speculation
CVE-2025-21853 bpf: avoid holding freeze_mutex during mmap operation
CVE-2025-21866 powerpc/code-patching: Fix KASAN hit by not flagging text patching area as VM_ALLOC
CVE-2025-21854 sockmap, vsock: For connectible sockets allow only connected
CVE-2025-21856 s390/ism: add release function for struct device

Showing top 20 of 26 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21844

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